LG WD-MD750WM Service Manual ▷ View online
24
Is the air chamber and the tube clogged?
Replace the
Main PCB
.
Is the
Connector
connected correctly to
the
Main PCB
and the
Pressure Switch
?
Or is the
Harness
alright ?
Reconnect or repair the
Connector
.
Or replace the
Harness
.
Check air chamber and remove the foreign material.
Replace the
Pressure Switch
.
YES
YES
NO
Is the resistance of the
Pressure Switch
out of range?
[Pin1 ~ Pin3]
[Pin1 ~ Pin3]
21~23Ω)
NO
NO
YES
Pressure Sensor S/W Error (PE)
NO
25
Is the door closed?
Is the Door assembly in line with door
switch ?
switch ?
Lift up & Close the door.
If the dE is displayed, Replace the
If the dE is displayed, Replace the
Door Bracket
.
Close the door totally.
YES
Reconnect or repair the
Connector
.
Or replace the
Harness
.
NO
Replace the
Latch Hook
.
NO
Replace the
Door switch
.
NO
Does the
Spring
of
Latch Hook
actuate?
Door Open Error (dE)
YES
YES
YES
NO
Scratch by Latch Hook
Touching
or
Is the
Connector
connected correctly to
the
Main PCB
and the
Door Switch
?
Or is the
Harness
alright ?
Does the
Door Switch
operate as follows?
* Door Locking time :
1~8
sec.
Check the time between from
input the power to parts
move up, then Door locked.
* Door Releasing time :
25~100
sec.
Check the time between from
off the power to parts
move down, then Door released.
1
1
1
YES
26
Is the resistance of the
Thermistor
out
of range 44 ~ 53 KΩ at 25°C?
(Page 17)
(Page 17)
Replace the
Main PCB
.
Is the
Connector
connected correctly to
the
Main PCB
and the
Thermistor
and
the
Heater
? Or is the
Harness
alright ?
Reconnect or repair the
Connector
.
Or replace the
Harness
.
Replace the
Thermistor
.
YES
Replace the
Heater
.
YES
NO
Is the resistance of the
Heater
out of
range 24.7 ~ 28.0Ω ? (Page 17)
[Note] Thermistor Spec
NO
NO
Thermistor (Heating) Error (tE)
S
P
E
C
P
E
C
Temp
30 °C
40 °C
60 °C
70 °C
95 °C
40 °C
60 °C
70 °C
95 °C
105 °C
Resistance (kΩ)
MIN
36.35
39.45
42.72
24.20
26.05
27.97
11.43
12.12
12.82
8.088
8.514
8.940
3.544
3.791
4.045
2.617
2.816
3.023
STD
MAX
NO
Are the resistance of the
Hall Sensor
5~15kΩ?
27
Motor Locked Error (LE)
[Pre Check]
• Gentle wash cycles, such as Perm Press, Delicates, Hand Wash, and Wool/Silk should only be used for smaller loads.
Because these cycles are more gentle in tumbling and spinning, putting too much in the drum can register an issue
with the motor. Remove items, reset unit and test with a Rinse/Spin cycle.
• Don’t replace the PCB, when the hall sensor is replaced.
Replace the PCB, when the LE is displayed after replacing the hall sensor.
Is the
Connector
connected correctly to
the
Main PCB
and the
Motor
?
Or is the
Harness
alright ?
YES
NO
YES
YES
YES
YES
NO
Disassemble the
Rotor
.
Are the
Magnet
of rotor cracked or broken ?
• Ha ~ Common
: 5 ~ 15 kΩ
• Hb ~ Common
: 5 ~ 15 kΩ
Replace the
Main PCB
.
Press the
Power
button &
Start / Pause
button.
Does the
Drum
stop when the start/pause button is pressed to start the cycle ?
Or Sometimes does the
Drum
rotate weakly (under 15rpm)?
Magnet
Ha
Hb
Common
Are the resistance same
between
Stator
points?
V~U / U~W / W~V : 8~11Ω
V U W
V U W
Reconnect or repair the
Connector
.
Or replace the
Harness
.
Replace the
Rotor
.
Replace the
Hall Sensor
.
Disassemble
hall sensor carefully.
(Next page)
hall sensor carefully.
(Next page)
NO
Replace the
Stator
.
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